Reed's new radar propels him from aggressive chaser to extreme scientist.

Reed, Sean and Tim face the strongest tornado conditions of the season.

Reed finds himself surrounded by powerful vortices in an erratic EF-2.

In Wyoming, Sean Casey captures the shot of a lifetime.

An EF-3 touches down right on top of Reed's armored research vehicle.

Armor offers little protection when the roof blows off the new Dominator.

The deadliest tornado of the season tears a 100-mile path across MS.

Reed pursues a TV weather reporter, and a longtime chaser calls it quits.

Tragedy strikes as Storm Chasers loses one of its own.

Sean's team struggles with a death, and Tim smokes out a monster.

South Dakota spins up the twister of the season.

Tim's team chases in the tornado twilight zone; Sean weathers controversy.

Storm and chasers collide in Minnesota for a final showdown.

The chase teams are on the front lines during an epic tornado outbreak.

The teams follow a storm headed toward downtown St. Louis.

Reed takes his team on a dangerous nighttime chase.